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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.lang3.reflect;

import org.apache.commons.lang3.BooleanUtils;

/**
 * 

Utility methods focusing on inheritance.

* * @since 3.2 */ public class InheritanceUtils { /** *

{@link InheritanceUtils} instances should NOT be constructed in standard programming. * Instead, the class should be used as * {@code MethodUtils.getAccessibleMethod(method)}.

* *

This constructor is {@code public} to permit tools that require a JavaBean * instance to operate.

*/ public InheritanceUtils() { super(); } /** *

Returns the number of inheritance hops between two classes.

* * @param child the child class, may be {@code null} * @param parent the parent class, may be {@code null} * @return the number of generations between the child and parent; 0 if the same class; * -1 if the classes are not related as child and parent (includes where either class is null) * @since 3.2 */ public static int distance(final Class child, final Class parent) { if (child == null || parent == null) { return -1; } if (child.equals(parent)) { return 0; } final Class cParent = child.getSuperclass(); int d = BooleanUtils.toInteger(parent.equals(cParent)); if (d == 1) { return d; } d += distance(cParent, parent); return d > 0 ? d + 1 : -1; } }




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